P Prabhakar Reddy (32), an SI at the Kuknoorpally police station, was found lying dead on a chair at his house in the government quarters.
The police suspect that he killed himself between 12.45 PM and 1 PM.
This is the second such incident at the same police station as another sub-inspector had ended his life by shooting himself in August last year.
Meanwhile, police are probing if there is any link between the alleged suicide of a Hyderabad-based beautician and Prabhakar.
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Police found Sirisha, who is married, dead inside the studio room after they broke open the door.
Asked if police suspect any link between the two deaths, Deputy Commissioner of Police A Venkateshwara Rao said, "Yes, We are probing that link."
As per the preliminary investigation, Prabhakar had allegedly misbehaved with Sirisha when she had gone to Kukunoorpally a couple of days ago.
Police suspect that the sub-inspector might have killed himself after learning about Sirisha's death as he was apparently scared of "consequences".
Police have picked up the owner of the photo studio and another person in connection with Sirisha's death and they are being questioned.
Prabhakar had taken over as the Kuknoorpally SI after his predecessor V Ramakrishna Reddy (45) had shot himself dead with his service revolver in August last year.
"Prabhakar was found dead with bullet injuries in his head. He was a 2012-batch SI and had taken over as the Kuknoorpally SI after his predecessor V Ramakrishna Reddy (45) shot himself with his service revolver," said a police source.
Telangana Director General of Police Anurag Sharma has ordered an inquiry into the incident.
"An inquiry has been ordered. Senior police officers are investigating the incident (and) they are looking into all the possible aspects," Sharma told PTI.
In August 2016, the then Kukunoorpally SI, V Ramakrishna Reddy, had committed suicide over alleged harassment by Deputy Superintendent of Police Sridhar Goud and other officers.
In a suicide note purportedly written by him, Reddy had held Goud and others "responsible" for his death.